a.
- 懷疑的，疑惑的[F][（+about/of）][+wh-]I'm doubtful whether she's still alive.
我懷疑她是否還健在。
- 可疑的，令人生疑的a doubtful remedy
療效可疑的療法
- 含糊的，不明確的；難以預測的The future looks very doubtful.
前途看來難以預測。
- （名聲等）不好的
衍生
ad.
doubtfully
辨析
同義:
a.懷疑的
uncertain irresolute vacillating indecisive distrustful suspicious incredulous disbelieving unsure questioning skeptical waveringa.疑慮的
questionable debatable disputable dubious problematic precarious incredible unbelievable unclear同義參見:
ambiguous alleged controversial improbable cynical fishy反義參見:
confident clear sure evident precise certain